SAL AMMONIAC. 337 Constituent Parts. Sal Ammoniac of Vesuviusi tlluriate ot' Ammonia, - 99.5 Muriate of Soda, - - 0 5 100.0 Klaproth, Beit. b. iii. s. 91. Geognostic Situation. As its name implies, it is a volcanic production, occur ring in the fissures, or on the surface of volcanic or pseudo-volcanic rocks. Geographic Situation. Europe.—It occurs in the vicinity of burning beds of roal, both in Scotland and England. It is found in the Island of'Iceland On the Continent, it is met with at Solfatara, Vesuvius, yEtna, the Lipari Islands, and Tus cany. Asia.—Thibet, Persia, and the Isle of Bourbon. America.—In volcanic districts both in North and South America. Second Subspecies. Conchoidal Sal Ammoniaci Muschlicher Sulmiak, Karsten, External Characters. Its colour is greyish-while. It occurs in angular pieces. Its surface is uneven. ^ 0, “ • Externally